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"The only gun control measure that had a statistically significant effect on the number of school shooting victims was the assault weapons ban," he writes. "When the assault weapons ban, state or federal, was in effect, the number of school shooting victims was 54.4 percent less than (when it was not in effect)."
Gius adds two cautionary notes to these findings. First, such laws are one of many factors influencing school-shooting deaths.
"States that had above-average unemployment and gun ownership rates, along with greater than average alcohol consumption and larger student-age populations, had greater number of school shooting victims," he writes.